Recent experimental results for the π + electric form factor from Jefferson Lab
The pion holds a special role in our quest to understand hadrons in terms of the underlying degrees of freedom of QCD. It is the lightest mass QCD system and is used as a test case for all models of hadronic structure. While the π+ form factor (Fπ) can be calculated using perturbative QCD at large Q2, its calculation in the intermediate Q2 transition region is more complex and model-dependent. Over the past several years, two experiments have been mounted at Jefferson Lab to measure Fπ over the range of Q2 = 0.6 to 2.45 GeV2. The technique utilizes a precision Rosenbluth separation of the p(e, e'π+)n reaction at low -t. Fπ is then extracted from the separated longitudinal response function (σL) with the aid of a model. The recent Jefferson Lab data are reviewed, with special emphasis on the extraction of the form factor from the σL data.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC05-060R23177
- OSTI ID:
- 955721
- Report Number(s):
- JLAB-PHY-06-635; 7418361; DOE/ER/40150-4435; TRN: US1004731
- Journal Information:
- Journal of Physics. Conference Series, Vol. 69; Conference: Paper compiled for APS Group on Hadronic Physics Meeting; ISSN 1742-6588
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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